they still do that i worked with a guy who was at a jiffylube for months and he said the manager told him to grab the shitty dirty air filter off the back wall throw it in the car keep the new one then sell them their old one back and if you wanted to replace it your self they still have your decently clean one to sell to someone else and the tranny flushes didnt do anything most of the time because they would drain it then refill with the same fluid